“Of all the new features in sendmail 8.10, one of the most
eagerly anticipated is its support for multiple queues. For sites
struggling under high volumes of mail, the benefits are numerous.
The kicker is that setting up multiple queues in sendmail 8.10 is
actually pretty simple.”
“Multiple queues let you speed up your mail service in three
main ways: by spreading the load among disks, by speeding up
queue runners, and by reducing the number of files per